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chemical change > chemical change ch8 > Flashcards

chemical change ch8 Flashcards

1
Q

physical properties

A

properties that you can either observe using your five senses — seeing, hearing, touching, smelling and tasting — or measure directly

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2
Q

chemical properties

A

properties that describe how a substance combines with other substances to form new chemicals or how a substance breaks up into two or more different substances

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3
Q

flammability

A

an indicator of how easily a substance catches fire

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4
Q

reactivity

A

a measure of how likely a particular metal is to take part in a displacement reaction

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5
Q

toxicity

A

the danger to your health caused when poisonous substances combine with chemicals in your body to produce new substances and damaging effects

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6
Q

Sublimation

A

a chemical process where a solid turns into a gas without going through a liquid stage.

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7
Q

melting

A

something that has become liquefied by heating.

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8
Q

evaporation

A

the process of turning from liquid into vapour.

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9
Q

solid

A

a hard object that is firm and stable in shape

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10
Q

Freezing

A

a phase transition in which a liquid turns into a solid when its temperature is lowered below its freezing point, also known as solidification.

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11
Q

liquid

A

a substance that flows freely but is of constant volume, having a consistency like that of water or oil.

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12
Q

condensation

A

water which collects as droplets on a cold surface when humid air is in contact with it

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13
Q

gas

A

an air-like fluid substance which expands freely to fill any space available, irrespective of its quantity.

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14
Q

Desublimation

A

the phase change from gas directly to solid, with no intermediate liquid phase.

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15
Q

deposition

A

the phase change from gas directly to solid, with no intermediate liquid phase.

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16
Q

Solidification

A

a phase change of matter that results in the production of a solid. also known as freezing

17
Q

reaction rate

A

speed at which a reaction takes place

18
Q

catalyst

A

chemical that helps to start or speed up a chemical reaction

19
Q

chemical change

A

change that results in a new substance being formed. During a chemical change, some chemical bonds break and others form.

20
Q

evaporates

A

change state from a liquid to a gas. Evaporation occurs only from the surface of a liquid.

21
Q

chemical reaction

A

a chemical change in which one or more new chemical substances are produced

22
Q

reactants

A

chemical substance used up in a chemical reaction. Some chemical bonds in a reactant are broken during the reaction.

23
Q

products

A

new chemical substance that results from a chemical reaction

24
Q

precipitate

A

solid product of a chemical reaction that does not dissolve in water

25
Q

rusting

A

the corrosion of iron

26
Q

corrosion

A

a chemical reaction that wears away a metal. Air, water or chemicals in air and water, as well as many household substances, can be corrosive. Many acids and other corrosive substances are dangerous.

27
Q

rust

A

a brown substance formed when iron reacts with oxygen and water

28
Q

surface protection

A

coating over a metal surface to prevent corrosion

29
Q

galvanising

A

protecting a metal by covering it with a more reactive metal that will corrode first

30
Q

burning

A

combining a substance with oxygen in a flame

31
Q

oxidation

A

chemical reaction involving the loss of electrons by a substance

32
Q

fossil fuel

A

substance, such as coal, oil and natural gas, that has formed from the remains of ancient organisms. Coal, oil and natural gas are often used as fuels; that is, they are burnt in order to produce heat.

33
Q

combustion

A

the process of combining with oxygen, most commonly burning with a flame

chemical change (1 decks)

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